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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/tools/quic/quic_simple_server_packet_writer.h"
#include "base/callback_helpers.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/metrics/sparse_histogram.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "net/udp/udp_server_socket.h"
namespace net {
namespace tools {
QuicSimpleServerPacketWriter::QuicSimpleServerPacketWriter(
UDPServerSocket* socket,
QuicBlockedWriterInterface* blocked_writer)
: socket_(socket),
blocked_writer_(blocked_writer),
write_blocked_(false),
weak_factory_(this) {
}
QuicSimpleServerPacketWriter::~QuicSimpleServerPacketWriter() {
}
WriteResult QuicSimpleServerPacketWriter::WritePacketWithCallback(
const char* buffer,
size_t buf_len,
const IPAddressNumber& self_address,
const IPEndPoint& peer_address,
WriteCallback callback) {
DCHECK(callback_.is_null());
callback_ = callback;
WriteResult result = WritePacket(buffer, buf_len, self_address, peer_address);
if (result.status != WRITE_STATUS_BLOCKED) {
callback_.Reset();
}
return result;
}
void QuicSimpleServerPacketWriter::OnWriteComplete(int rv) {
DCHECK_NE(rv, ERR_IO_PENDING);
write_blocked_ = false;
WriteResult result(rv < 0 ? WRITE_STATUS_ERROR : WRITE_STATUS_OK, rv);
base::ResetAndReturn(&callback_).Run(result);
blocked_writer_->OnCanWrite();
}
bool QuicSimpleServerPacketWriter::IsWriteBlockedDataBuffered() const {
// UDPServerSocket::SendTo buffers the data until the Write is permitted.
return true;
}
bool QuicSimpleServerPacketWriter::IsWriteBlocked() const {
return write_blocked_;
}
void QuicSimpleServerPacketWriter::SetWritable() {
write_blocked_ = false;
}
WriteResult QuicSimpleServerPacketWriter::WritePacket(
const char* buffer,
size_t buf_len,
const IPAddressNumber& self_address,
const IPEndPoint& peer_address) {
scoped_refptr<StringIOBuffer> buf(
new StringIOBuffer(std::string(buffer, buf_len)));
DCHECK(!IsWriteBlocked());
DCHECK(!callback_.is_null());
int rv;
if (buf_len <= static_cast<size_t>(std::numeric_limits<int>::max())) {
rv = socket_->SendTo(
buf.get(),
static_cast<int>(buf_len),
peer_address,
base::Bind(
&QuicSimpleServerPacketWriter::OnWriteComplete,
weak_factory_.GetWeakPtr()));
} else {
rv = ERR_MSG_TOO_BIG;
}
WriteStatus status = WRITE_STATUS_OK;
if (rv < 0) {
if (rv != ERR_IO_PENDING) {
UMA_HISTOGRAM_SPARSE_SLOWLY("Net.QuicSession.WriteError", -rv);
status = WRITE_STATUS_ERROR;
} else {
status = WRITE_STATUS_BLOCKED;
write_blocked_ = true;
}
}
return WriteResult(status, rv);
}
QuicByteCount QuicSimpleServerPacketWriter::GetMaxPacketSize(
const IPEndPoint& peer_address) const {
return kMaxPacketSize;
}
} // namespace tools
} // namespace net
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